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Questions about unresolvable IP addresses

Hello,

I have been reading where many system administrators have decided to block all access to their systems from IP addresses that do not resolve. I have heard and read both sides of the debate and see this as the "golden double-edged sword" where it could be a blessing beyound all or a devistating curse.

I would like input and opinions from AO users. I have been considering this for two years now for my servers seeing that harvesters and spammers tend to proliferate in the unresolvable blocks.